Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
  • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D27/00—Cartridge filters of the throw-away type
  • B01D27/04—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper
  • B01D27/06—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper with corrugated, folded or wound material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
  • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
  • B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
  • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
  • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/04—Supports for the filtering elements
  • B01D2201/0407—Perforated supports on both sides of the filtering element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/04—Supports for the filtering elements
  • B01D2201/0415—Details of supporting structures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/40—Special measures for connecting different parts of the filter
  • B01D2201/4015—Bayonet connecting means

Definitions

• the present invention relates to a filter cartridge which is suitable for filtering liquid and gas. ore particularly, the present invention relates to a filter cartridge for filtering a liquid agent containing large amounts of various foreign matters, such as an amine-type organic release agent used on a substrate for electronic parts (e.g. a semiconductor wafer and a glass substrate for a liquid crystal device) ; a pigment-dispersion photoresist for a glass substrate of a liquid crystal device; a slurry for a chemical and mechanical abrasion device; and other liquids used in general industry.
• Two different and specific basic cartridges generally used for filtering gas and liquid are a depth filter (representatively a roll type filter) and a membrane filter (usually a pleated filter) .
• a filter cartridge that has a filter body comprising: a depth filter containing non-woven fiber mass in the form of either roll or seamless fiber cylinder; and a pleated screen filter or a surface filter that can be encased in the same housing with the depth filter.
• a filter body comprising: a depth filter containing non-woven fiber mass in the form of either roll or seamless fiber cylinder; and a pleated screen filter or a surface filter that can be encased in the same housing with the depth filter.
• filters that can attain specific properties, such as increasing throughput -and removing metal ions.
• FIGs. 1 and 2 show a conventional filter cartridge disclosed in Japanese Patent Application Kokai No. 7-213814.
• a cartridge 10 has a depth filter 16 having an exposed outer surface 12, in the form of roll or seamless fiber cylinder; a pleated surface filter or screen filter 18 concentrically arranged in within the depth filter; a core 20 supporting the inner surface of the surface filter 18 as well as having a number of holes 23 as fluid passages; and a fluid outlet 14 for withdrawing a filtrate fluid (liquid or gas) from the core 20.
• the top end of the depth filter 16 and that of the surface filter 18 are sealed.
• the top end of the filter cartridge 10 is completely sealed with a cap 19.
• the filter cartridge 10 Upon its use, the filter cartridge 10 is inserted into ahousing 21 of a filterdevice, and liquid-tightly fixed to the wall of the housing via a thread means and/or an 0-ring provided around the fluid outlet 14.
• a fluid (liquid or gas) to be purified is introduced between the housing 21 and the cartridge 10, and the fluid passes from the outer surface 12 towards the inside of the depth filter 16, and then through the surface filter 18.
• the purified fluid flows out to the central passage through the holes 23 of the core 20, and is withdrawn as a filtrate from the fluid outlet 14.
• the filter located upstream has relatively large pore diameter, while the filter located downstream has relatively small pore ⁇ Lameter, in order to increase the level of purification and to elongate the life of the filter.
• the above-mentioned two filters are integrally formed to be a single filter element, and have disadvantages in that various possible filter combinations should be prepared that satisfy various purposes.
• the upstream filter is contarr ⁇ nated faster as compared with the downstream filter, and thus even when the downstream filter is not contaminated, the filter element cannot be used anymore, because of the shorter life of the upstream filter.
• the object of the present invention is to provide a filter cartridge comprising an upstream filter unit and a downstream filter unit, wherein both units can be combined to each other so that the upstream filter locates between the downstream filter and the housing to form a cartridge and the combination can be properly selected depending on the purpose such as the removal of metal ions and can elongate the filter life.
• the present invention provides a filter element comprising a combination of an upstream filter and a downstream filter, wherein the upstream filter is replaceable.
• the life of the downstream filter is elongatedwhile attaining the required purified level, -and in addition, smaller number of filters is required in order to obtain the same amount of filtrate as that in the case of the conventional filter.
• the present invention also provides a filter element comprising an upstream filter and a downstream filter, each of which is properly selected depending on the specific purposes, from the stock of various filters expected to be used in various applications.
• the upstream filter should be replaceable, although it may be integrally formed as a part of a disposable filter device, if necessary.
• the preset invention provides a filter element comprising an upstream filter and a downstream filter, wherein said downstream filter has a means for fixing to a housing, -and said upstream filter is f xable to said downstream filter fixed to said housing; -and a filter device containing said filter element fixed to the housing.
• the downstream filter has a first threadpart
• the housing has a second thread part which engages with the first thread part.
• downstream filter is integrally formed with the housing.
• the upstream filter is fixed to the downstream filter via fitting.
• the upstream filter and the downstream filter are in the form of cylinder and so arranged that one nests in the other.
• the upstream and downstream filters may have the same or different filter membrane selected from the group consisting of a pleated type, roll type or seamless fiber cylinder type depth filter ccnta ⁇ ning nonwoven fiber mass; and a porous foam, hollow fiber or pleated membrane filter.
• a roll type filter may comprise various kinds of filter bodies rolled together, and the roll type filter may also have a density gradient.
• the upstream filter may be a member selected from a set of filters, which set is different from a set from which a member is selected as a downstream filter.
• the present invention also provides a filter device containing the above-mentioned filter element.
• the upstream filter comprises, in the order from inside, a porous inner support cylinder made of resin (core) , and a filter body in the form of sheet rolled around the core. If necessary, the upstream filter further comprises an outer support cylinder made of resin (sleeve) or alternatively a resin net, which surrounds the filter body. The top edge and the bottom edge of the upstream filter are sealed with resin caps.
• the downstream filter comprises, in the order from inside, a porous inner support cylinder (core) , a filter body surrcunding the core, and a porous outer support cylinder (sleeve) or alternatively a net, which supports the outer surface of the filter body.
• the top edge and the bottom edge of the downstream filter are sealed with resin caps.
• the combination of filters that comprises the filter body can be properly selected depending on the purpose.
• the upstream filter has a filter body comprising a pleated type, roll type or seamless fiber cylinder type depth filter containing non-woven fiber mass; and a porous foam, hollow fiber or pleated mebrane filter.
• the upstream filter locates upstream the downstream filter in the housing, and it may not be mechanically combined with a downstream cartridge, although it is preferred that both ends of the upstream filter be sealed with caps having the structure which can be mechanically and liquid-tightly combined with the downstream cartridge.
• the downstream filter is a filter cartridge having a filter body comprising a pleated type, roll type or seamless fiber cylinder type depth filter containing non-woven fiber mass; and a porous foam, hollow fber or pleatedmerribrane filter.
• One end of the downstream filter is sealed with a cap, while the other end is sealed with a cap having a fluid inlet or a fluid outlet.
• Each of the caps may be combinedwith the upstream filtervia a twist-lock, anO-ring, and/or a thread. However, it may not necessarily be combined.
• the materials for the filter body used for the upstream and downstream filters canbe selected from those known inthe art. Examples include PP (polypropylene) ,
• PTEE polytetrafluoroethylene
• UHMWPE ultra-high molecular weight polyethylene
• PE polyethylene
• HDPE high-density polyethylene
• the inside and outside support cylinders of the upstream and downstream filters are made of rigid resin. When a net is used instead of the support cylinder, it can be made of the same material.
• the top and bottom caps may be in the form of ring or disk, depending on the position at which they are used. They are fused by heat with the top or bottom edge of the laminated structure composed of the inner and outer cylinders (or parts of the net) and the filter body. The material for the caps is also selected from those known in the art.
• filter element means the combination of an upstream filter and a downstream filter
• filter device means a device in which a filter element is installed into a housing to form a usable device
• upstream means the relative position with respect to the gas or liquid flow (feed) to be purified. As will be described below, a part of the feed can be led directly into the downstream filter, depending on the required cleanliness for the purpose.
• Figs. 3 - 6 illustrate the filter element -and the filter device according to Example 1 of the present invention.
• the terms “top” and “bottom” are used for the sake of convenience, and the axis line can be set to an arbitrary direction, such as the horizontal direction.
• Fig.3 shows a filter device 32 of thepresent invention inwhich a filter element 30 (see Fig.6) of the present invention is installed.
• Fig.4 shows aperspective view of an upstream filter 34
• Fig. 5 shows a perspective view of an downstream filter 36
• Fig. 6 shows a filter element in which the upstream filter 34 is partially inserted into the downstream filter 36.
• the upstream filter 34 has a filter body 38 comprising a pleated type, roll type or seamless fiber cylinder type depth filter containing nonwoven fiber mass; and a porous foam, hollow fiber or pleated membrane filter. All of these filter body types are known in the -art, and the description canbe found, for example, in the above-mentioned references.
• the upstream filter 34 is located upstream of the downstream filter in the housing, -and it may not be liquid-tightly combined with the downstream filter
• the downstream filter 36 i.e. bypassing may occur which allows a small amount of flow
• it canbe liquid-tightly combinedwith the downstream filter 36 (i.e. there is no bypass to the downstream filter) .
• the figures illustrate the former, and the top end of the filter body 38 is sealed with an annular cap 44 made of resin, and the bottom end is sealed with an annular cap 42 made of resin.
• the inner surface of the cap 42 has two projections 46 at diametrically opposite positions for fixing the upstream filter 34 to the downstream filter 36. If the bypass of the feed to the downstream filter 36 is required to be blocked, the top and bottom ends of the caps 42 and 44 are sealed using O-rings.
• porous support cylinder or cylinders made of rigid resin can be placed, and the top and the bottom ends can be integrally combined to the caps 42 and 44, respectively.
• the figures contain a thin support cylinder 43 located inside the upstream filter.
• the downstream filter 36 is a filter cartridge having a filter body 48 comprising a pleated type, roll type or seamless fiber cylinder type depth filter containing non-woven fiber mass; and a porous foam, hollow fiber or pleatedmembrane filter.
• the top end thereof is sealed with an annular cap 52, and the bottom end is sealed with a cap 50.
• Each of the caps may be combined with the upstream filter by means of a twist-lock, an O-ring, and/or a thread.
• the filters may not be mechanically combined together and the upstream filter 34 may merely cover the downstream filter 36.
• rigid support cylinder(s) having a number of circulatory holes 56 is provided.
• the rigid outer support cylinder 54 and the rigid inner support cylinder 62 are provided, and the top and bottom ends of the cylinders are integrally combined to the caps 52 and 50, respectively.
• a filtrate outlet 60 is formed having an O-ring for air-tightly or liquid-tightly fixing the downstream filter to the housing 70 (Fig.3) .
• the outlet is connected to the inside of the inner support cylinder 62.
• the circumference of the cap 50 has two twist-lock grooves 58, each of which acccrrrnodates the projection 46 of the upstream filter 34.
• the introductionpart of eachof the twist-lock grooves has a wide opening whichaccepts theprojection 46 in the direction of the axis, and a locking groove 64 connected to the opening is formed, which locks the projection 46 when the upstream filter is rotated.
• the inner downstream filter 36 is in the middle of the insertion into the outer upstream filter 34.
• FIG. 3 shows a condition in which both filters are combined at the deterttiinedposition. Except the initial installation, the upstream filter 34 and the downstream filter 36 are replaced by the fresh ones at the work site of filtration, and the upstream filter 34 is likely to be replaced more frequently as compared with the downstream filter 36.
• Figs. 7 and 8 illustrate one embodiment of the upstream filter 34 and the downstream filter 36.
• the upstream filter 34 comprises, in the order from the inside, an inner support cylinder 43 having pores 45 and a roll type filter body 38 having fine pores, rolled around the inner support cylinder 43.
• the downstream filter 36 comprises, in the order from the inside, an inner support cylinder 62 having holes 56, a pleated type filter body 48 surrcinding the inner support cylinder 62, -and an cuter support cylinder 54 having pores 55, supporting the outer surface of the pleated filter body 48.
• Various constructions of filter bodies can be properly selected, depending on the purpose.
• the housing 70 has a housing bowl 71 wherein the top end thereof is opened and the bottom end thereof is closed except a drain outlet 80.
• the top end of the housing can be air-tightly or liquid-tightly engaged to a round wall of a housing head 74 via an O-ring.
• the outer surface of the round wall of the housing head 74 has an external thread, to which an internal thread of a fastening ring 72 is engaged.
• the feed flows from the inlet 76 of the housing head 74 to the space between the upstream filter 34 and the housing bowl 71, and then passes through the filter body 38.
• the unfiltered portion of the feed flows to the bottom of the housing bowl 71 -and is discharged from the drain outlet 80 as a drain flow.
• a portion of the feed may be bypassed and flows directly around the downstream filter 34, but depending on the purpose, this is -allowable.
• O-rings canbe placedbetween the annular caps 44 and 52, and between the annular caps 42 and 50, in order to prevent the formationof bypass, as mentioned above.
• the semi-filtrate that has beenpassed through the filter body 38 is then passed through the filter body 48 of the downstream filter 36 and further purified.
• the filtrate flows into the inner porous support cylinder 62, and exits from the filtrate outlet 78 of the housing head 74. Clogging of the downstream filter 34 is not likely to occur, while clogging of the upstream filter 36 occurs easily. Therefore, the flow rate of the filtrate is measured while watching clogging of the upstream filter 34, and when the upstream filter 34 is considered to have been clogged, the flow is paused and the housing bowl 71 is removed to replace the upstream filter with fresh one.
• the housing 70 and the housing head 74 are engaged together via an O-ring, and the internal thread of the fastening ring 72 is screwed into the external thread of the housing head 74, thereby allowing the opposite end of the fastening ring to urge the housing against the edge of the housing head 74.
• a filter body of the upstream filter a five-layered roll filter obtained by rolling up a non-woven sheet made of PP
• the upstream filter was replaced by fresh one, and the operation was resumed.
• the result is shown in Fig. 9.
• the filtration was conductedwith three replacements and four 8-minutes operations, and the total amount of filtrate was 3.5 times as much as the amount when only one filter is used.
• the filter element of the present invention can attain approximately 87 % of the amount of filtrate using the conventional filter element (3.5 times / 4 times) , though with respect to the number of downstream filters, only 25 % of the conventional filter is required (1 downstream filter / 4 filter elements) .
• the present invention is effective.
• the present invention is advantageous in that, by preparing various kinds of upstream filters 34 and downstream filters 36 and combining those, various filter element can be obtained depending on the purpose.
• various modifications can be made in the scope of the present invention.
• the upstream filter 34 is placed outside the downstream filter 36.
• modification canbe made byproperly changing the flow route and the downstream filter may be placed outside the upstream filter.
• an O-ring is provided on the outlet 60 of the downstream filter 36, for fixing the downstream filter to the housing.
• the downstream filter can be connected using only the O-ring. In this case, it is simply a tight-fit.
• the downstream filter can be integrally formed with the housing. In this case, the downstream filter is disposable.
• the upstream filter is loosely connected with the downstream filter, and bypassing to the downstream filter may occur, though the amount is small.
• a disk-shape cap can be used to seal the bottom end of the upstream filter 34, instead of the annular cap 42, or O-rings can be placed around the caps 42 and 44 as mentioned above, so that the spaces between the caps 42 and 50, and between the caps 44 and 52 are sealingly closed.
• a group consisting of plurality of the upstream filter and a group consisting of plurality of the downstream filter are prepared, and a combination of the upstream filter and the downstream filter can be properly selected depending on the purpose. Both filters can be fixed to the same sealing cap.
• the upstream filter cannot be replaced, thus it is disposable type.
• a combination of the upstream filter and the downstream filter composing the filter element of the present invention is properly selected depending on the purpose, which provides advantages in that various kinds of filter device having designated purpose can be attained effectively.
• the filter element and the filter device having the above-mentioned features, long-term usage of the downstream filter becomes possible, which has been impossible with one conventional housing.
• a group of the upstream filter and a group of the downstream filter is prepared and, two filters each selected from different group are used in combination.
• a user or an installer of the filter can properly select the filter combination and the filter can be replaced at any time. It is also possible to render additional property to an upstream filter, such as ion removing ability.
• Fig. 1 shows a partial cross-section of a filter device having a conventional filter element.
• Fig. 2 shows a specific phase diagram showing a conventional filter device having a conventional filter element.
• Fig. 3 shows a longitudinal section of a filter device into which a filter element of the present invention is fixed.
• Fig. 4 shows a perspective view of the upstream filter that is a component of the filter element of the present invention.
• Fig. 5 shows a perspective view of the downstream filter that is a component of the filter element of the present invention.
• Fig. 6 shows a perspective view of one embodiment of the present invention in which the filter elements are combined.
• Fig. 7 shows a plane cross section along the line IV - TV in Fig. 3.
• Fig.8 shows a perspective view of the cross section of the filter element along the line VIII - VIII in Fig. 3.
• Fig. 9 shows a graph showing relationships between the flow time of the feed and the total quantity of the filtrate in the case of the filter device of the present invention.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Filtration Of Liquid (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=25513934

Family Applications (1)

Country Status (6)

Families Citing this family (34)

Citations (7)

Family Cites Families (14)

• 2001
  • 2001-10-01 US US09/968,225 patent/US7087166B1/en not_active Expired - Fee Related
• 2002
  • 2002-09-26 EP EP02778340A patent/EP1436063A4/en not_active Withdrawn
  • 2002-09-26 JP JP2003532165A patent/JP2005504625A/ja active Pending
  • 2002-09-26 WO PCT/US2002/030495 patent/WO2003028845A1/en not_active Ceased
  • 2002-09-26 CN CNB028194020A patent/CN100333818C/zh not_active Expired - Fee Related
  • 2002-09-26 KR KR10-2004-7004741A patent/KR20040045038A/ko not_active Ceased
• 2006
  • 2006-06-14 US US11/452,759 patent/US20060231475A1/en not_active Abandoned

Patent Citations (7)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events